单项选择题

When did NASA first sent astronauts to the moon

A．30 years ago
B．31 years ago
C．32 years ago
D．33 years ago
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单项选择题
What will the college students do for the high school students
A．Employ them as lab assistants.
B．Teach classes at their high school.
C．Help them with their studies.
D．Pay them for participating in the study.
单项选择题
Some European retailers warned that they would ______, if their stock isn’t released soon.
A．close their stores
B．resort to legal action
C．take on a strike
D．take some violent actions
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